Use mimic-fn

package.json

@@ -47,6 +47,7 @@
     "json-schema-faker": "0.5.0-rc15",
     "lodash": "^4.17.10",
     "methods": "^1.1.2",
+    "mimic-fn": "^1.2.0",
     "moize": "^5.4.2",
     "node-notifier": "^5.4.0",
     "openapi-schema-to-json-schema": "^2.2.0",

src/utils/keep_props.js

@@ -1,28 +1,16 @@
 'use strict'
 
+const mimicFn = require('mimic-fn')
+
 // Wraps a functor so it does not modify a function `name`, `length`, etc.
 const keepProps = function(functor) {
   return (originalFunc, ...args) => {
     const wrappedFunc = functor(originalFunc, ...args)
-
-    copyProperties({ originalFunc, wrappedFunc })
-
+    mimicFn(wrappedFunc, originalFunc)
     return wrappedFunc
   }
 }
 
-const copyProperties = function({ originalFunc, wrappedFunc }) {
-  Reflect.ownKeys(originalFunc).forEach(propName =>
-    copyProperty({ originalFunc, wrappedFunc, propName }),
-  )
-}
-
-const copyProperty = function({ originalFunc, wrappedFunc, propName }) {
-  const prop = Object.getOwnPropertyDescriptor(originalFunc, propName)
-  // eslint-disable-next-line fp/no-mutating-methods
-  Object.defineProperty(wrappedFunc, propName, prop)
-}
-
 module.exports = {
   keepProps,
 }